#!/usr/bin/make -f

# Uncomment this to turn on verbose mode.
#export DH_VERBOSE=1

export DH_GOPKG := github.com/fsouza/go-dockerclient
export DH_GOLANG_INSTALL_EXTRA := testing/data
#export DH_GOLANG_EXCLUDES :=

# Build with Go 1.13, it FTBFS with Go 1.10 which is the default in Bionic.
export PATH := /usr/lib/go-1.13/bin:$(PATH)
# Set GOCACHE to a temp directory, dh-golang sets it to "off" but this is not
# accepted by Go >= 1.12
export GOCACHE := $(shell mktemp -d)
# GO111MODULE needs to be set to "off" to avoid checking modules information online
export GO111MODULE := off

%:
	dh $@ --buildsystem=golang --with=golang --builddirectory=_build

## http://wiki.debian.org/onlyjob/get-orig-source
.PHONY: get-orig-source
PKD   = $(abspath $(dir $(MAKEFILE_LIST)))
PKG   = $(word 2,$(shell dpkg-parsechangelog -l$(PKD)/changelog | grep ^Source))
VER  ?= $(shell dpkg-parsechangelog -l$(PKD)/changelog -SVersion | perl -ne 'print $$1 if m{^(?:\d+:)?(\d.*)(?:\-\d+.*)};')

get-orig-source: $(PKG)_$(VER).orig.tar.xz $(info I: $(PKG)_$(VER))
	@

UURL = https://$(DH_GOPKG).git
UDATE = $(shell date --rfc-3339=seconds --date='TZ="UTC" $(shell echo $(VER) | perl -ne 'print "$$1-$$2-$$3" if m/\+(?:git|svn|hg)(\d{4})(\d{2})(\d{2})/')')
$(PKG)_$(VER).orig.tar.xz: $(info I: UDATE=$(UDATE))
	$(if $(wildcard $(PKG)-$(VER)),$(error $(PKG)-$(VER) exist, aborting..))
	@echo "# Downloading..."
	git clone --recursive --single-branch --branch master $(UURL) $(PKG)-$(VER) \
        || $(RM) -r $(PKG)-$(VER)
	cd $(PKG)-$(VER) \
        && git checkout v$(VER) || git checkout $$(git log -n1 --format=%h --before="$(UDATE)") \
        && [ -s ChangeLog ] || ( echo "# Generating ChangeLog..." \
           ; git log --pretty="format:%ad  %aN  <%aE>%n%n%x09* %s%n" --date=short > ChangeLog \
           ; touch -d "$$(git log -1 --format='%ci')" ChangeLog) \
        && echo "# Setting times..." \
        && git ls-tree -r --name-only HEAD | while read F ; do touch --no-dereference -d "$$(git log -1 --format="%ai" -- "$$F")" "$$F"; done \
        && echo "# Cleaning-up..." \
        && $(RM) -rv `perl -0nE 'say $$1 if m{^Files\-Excluded\:\s*(.*?)(?:\n\n|Files:|Comment:)}sm;' ../debian/copyright` \
        && $(RM) -r .git .git*
	@echo "# Packing..."
	find -L "$(PKG)-$(VER)" -xdev -type f -print | LC_ALL=C sort \
        | XZ_OPT="-6v" tar -caf "$(PKG)_$(VER).orig.tar.xz" -T- --owner=root --group=root --mode=a+rX \
        && $(RM) -r "$(PKG)-$(VER)"
